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Physics / Waves and Sound

Physics / Waves and Sound

Electromagnetic radiation, is the flow of energy at the universal speed of light through free space or through a material medium in the form of electric and magnetic fields that make up the electromagnetic waves such as radio waves, visible light, and gamma rays. Electromagnetic radiation is a fundamental phenomenon of electromagnetism, behaving as waves and also as particles called photons which travel through space carrying radiant energy.

The world around us is full of different sounds. They range from pleasant bird calls to the uncomfortable noise of machines. We do not see sound, but we can hear it when it reaches our ears.Sound is a form of energy and it comes from vibrations. These vibrations create sound waves which move through mediums such as air and water before reaching our ears. Understand how sound waves come from vibrations in the form of compression and rarefaction and how your ears give you the ability to hear them.
Sound propagation requires a material medium. Understand how sound waves propagate in the form of compression and rarefaction and how your ears give you the ability to hear them.
The speed of sound is different in different media given by V = \sqrt{\frac{E}{d}},
where E = modulus of elasticity = density of medium.
Speed of sound is fastest in solids, moderate in liquids and slowest in gases.
Understand the various factors affecting the speed of sound in a gas.
Wavelength - The speed of sound does not depend on wavelength of sound wave
Effect of Density - V = \frac{1}{\sqrt{d}}. The speed of sound is inversely proportional to the square root of density of the gas.
Pressure - The speed of sound is independent of the pressure.
Temperature - The speed of sound increases with the increase in temperature of the gas.

Exercises
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Exercises
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• Questions: 10

Sound Waves - SmartTest

SmartTest on Sound Waves

• Questions: 10
• Mechanical Waves